<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* css重置 */
        * {
            margin: 0;
            padding: 0;
        }

        ul,
        li {
            list-style: none;
        }

        .box {
            width: 1460px;
            height: 140px;
            background-color: red;
            /* border: 1px solid #333; */
            margin: 0 auto;

        }

        .box ul li {
            width: 276px;
            height: 140px;
            background-color: #fff;
            /* 设置为行内块有个缝隙 */
            /* display: inline-block; */
            /* 添加左浮动 */
            float: left;
            margin-right: 20px;
        }

        /* 最后一个li */
        .box ul li:last-child {
            margin-right: 0;
        }

        /* 健壮性 */
    </style>
</head>

<body bgcolor="#f4f4f4">
    <div class="box">
        <ul>
            <li>内容</li>
            <li>内容</li>
            <li>内容</li>
            <li>内容</li>
            <li>内容</li>
        </ul>
    </div>
</body>

</html>